There is nothing wrong with retelling a story in a different cultural context. We've seen Anime based on stories of Western origin, and I'd like to see more. I'd like to see Annie on My Mind re-imagined as a Yuri Anime or Manga, replace the role played by the Egyptian section of the Museum with a Shinto Shrine.
My problem with White Washing in Anime adaptations is when that seems likely to be the only Live Action version that property will have since Japan's film industry can't afford to do justice to many of these stories.
Death Note however has had two Live Action adaptations made in Japan with mostly Japanese casts. Including characters who were heavily implied to be White in the Anime, like the clearly British Watari, or Near and Mello who seemed to be Germanic. L himself is more controversial as some think he may have been part Japanese, but the name usually revealed to be his real name is a European one.
This Death Note adaptation has some diversity to it, with L being African American.
So I really don't have a problem with the ultimate privileged entitled misogynist douche who thinks he deserves to decide who lives and dies being White.
And I frankly would have liked Misa to be able to Blonde in live action for once, but instead we're still not getting that.
There are other issues I may have this show. Mainly I'm really annoyed it's going be on Netflix. But I'll have to wait till I know more.